ip/iplink_vxlan.c

   1 /*
   2  * iplink_vxlan.c       VXLAN device support
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Stephen Hemminger <shemminger@vyatta.com
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <net/if.h>
  16 #include <linux/ip.h>
  17 #include <linux/if_link.h>
  18 #include <arpa/inet.h>
  19
  20 #include "rt_names.h"
  21 #include "utils.h"
  22 #include "ip_common.h"
  23
  24 static void print_explain(FILE *f)
  25 {
  26         fprintf(f, "Usage: ... vxlan id VNI [ { group | remote } IP_ADDRESS ] [ local ADDR ]\n");
  27         fprintf(f, "                 [ ttl TTL ] [ tos TOS ] [ dev PHYS_DEV ]\n");
  28         fprintf(f, "                 [ dstport PORT ] [ srcport MIN MAX ]\n");
  29         fprintf(f, "                 [ [no]learning ] [ [no]proxy ] [ [no]rsc ]\n");
  30         fprintf(f, "                 [ [no]l2miss ] [ [no]l3miss ]\n");
  31         fprintf(f, "                 [ ageing SECONDS ] [ maxaddress NUMBER ]\n");
  32         fprintf(f, "                 [ [no]udpcsum ] [ [no]udp6zerocsumtx ] [ [no]udp6zerocsumrx ]\n");
  33         fprintf(f, "                 [ [no]remcsumtx ] [ [no]remcsumrx ]\n");
  34         fprintf(f, "                 [ [no]external ] [ gbp ]\n");
  35         fprintf(f, "\n");
  36         fprintf(f, "Where: VNI := 0-16777215\n");
  37         fprintf(f, "       ADDR := { IP_ADDRESS | any }\n");
  38         fprintf(f, "       TOS  := { NUMBER | inherit }\n");
  39         fprintf(f, "       TTL  := { 1..255 | inherit }\n");
  40 }
  41
  42 static void explain(void)
  43 {
  44         print_explain(stderr);
  45 }
  46
  47 static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
  48                           struct nlmsghdr *n)
  49 {
  50         __u32 vni = 0;
  51         int vni_set = 0;
  52         __u32 saddr = 0;
  53         __u32 gaddr = 0;
  54         __u32 daddr = 0;
  55         struct in6_addr saddr6 = IN6ADDR_ANY_INIT;
  56         struct in6_addr gaddr6 = IN6ADDR_ANY_INIT;
  57         struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
  58         unsigned int link = 0;
  59         __u8 tos = 0;
  60         __u8 ttl = 0;
  61         __u8 learning = 1;
  62         __u8 proxy = 0;
  63         __u8 rsc = 0;
  64         __u8 l2miss = 0;
  65         __u8 l3miss = 0;
  66         __u8 noage = 0;
  67         __u32 age = 0;
  68         __u32 maxaddr = 0;
  69         __u16 dstport = 0;
  70         __u8 udpcsum = 0;
  71         bool udpcsum_set = false;
  72         __u8 udp6zerocsumtx = 0;
  73         bool udp6zerocsumtx_set = false;
  74         __u8 udp6zerocsumrx = 0;
  75         bool udp6zerocsumrx_set = false;
  76         __u8 remcsumtx = 0;
  77         __u8 remcsumrx = 0;
  78         __u8 metadata = 0;
  79         __u8 gbp = 0;
  80         int dst_port_set = 0;
  81         struct ifla_vxlan_port_range range = { 0, 0 };
  82
  83         while (argc > 0) {
  84                 if (!matches(*argv, "id") ||
  85                     !matches(*argv, "vni")) {
  86                         NEXT_ARG();
  87                         if (get_u32(&vni, *argv, 0) ||
  88                             vni >= 1u << 24)
  89                                 invarg("invalid id", *argv);
  90                         vni_set = 1;
  91                 } else if (!matches(*argv, "group")) {
  92                         NEXT_ARG();
  93                         if (!inet_get_addr(*argv, &gaddr, &gaddr6)) {
  94                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
  95                                 return -1;
  96                         }
  97                         if (!IN6_IS_ADDR_MULTICAST(&gaddr6) && !IN_MULTICAST(ntohl(gaddr)))
  98                                 invarg("invalid group address", *argv);
  99                 } else if (!matches(*argv, "remote")) {
 100                         NEXT_ARG();
 101                         if (!inet_get_addr(*argv, &daddr, &daddr6)) {
 102                                 fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 103                                 return -1;
 104                         }
 105                         if (IN6_IS_ADDR_MULTICAST(&daddr6) || IN_MULTICAST(ntohl(daddr)))
 106                                 invarg("invalid remote address", *argv);
 107                 } else if (!matches(*argv, "local")) {
 108                         NEXT_ARG();
 109                         if (strcmp(*argv, "any")) {
 110                                 if (!inet_get_addr(*argv, &saddr, &saddr6)) {
 111                                         fprintf(stderr, "Invalid address \"%s\"\n", *argv);
 112                                         return -1;
 113                                 }
 114                         }
 115
 116                         if (IN_MULTICAST(ntohl(saddr)) || IN6_IS_ADDR_MULTICAST(&saddr6))
 117                                 invarg("invalid local address", *argv);
 118                 } else if (!matches(*argv, "dev")) {
 119                         NEXT_ARG();
 120                         link = if_nametoindex(*argv);
 121                         if (link == 0) {
 122                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 123                                         *argv);
 124                                 exit(-1);
 125                         }
 126                 } else if (!matches(*argv, "ttl") ||
 127                            !matches(*argv, "hoplimit")) {
 128                         unsigned int uval;
 129
 130                         NEXT_ARG();
 131                         if (strcmp(*argv, "inherit") != 0) {
 132                                 if (get_unsigned(&uval, *argv, 0))
 133                                         invarg("invalid TTL", *argv);
 134                                 if (uval > 255)
 135                                         invarg("TTL must be <= 255", *argv);
 136                                 ttl = uval;
 137                         }
 138                 } else if (!matches(*argv, "tos") ||
 139                            !matches(*argv, "dsfield")) {
 140                         __u32 uval;
 141
 142                         NEXT_ARG();
 143                         if (strcmp(*argv, "inherit") != 0) {
 144                                 if (rtnl_dsfield_a2n(&uval, *argv))
 145                                         invarg("bad TOS value", *argv);
 146                                 tos = uval;
 147                         } else
 148                                 tos = 1;
 149                 } else if (!matches(*argv, "ageing")) {
 150                         NEXT_ARG();
 151                         if (strcmp(*argv, "none") == 0)
 152                                 noage = 1;
 153                         else if (get_u32(&age, *argv, 0))
 154                                 invarg("ageing timer", *argv);
 155                 } else if (!matches(*argv, "maxaddress")) {
 156                         NEXT_ARG();
 157                         if (strcmp(*argv, "unlimited") == 0)
 158                                 maxaddr = 0;
 159                         else if (get_u32(&maxaddr, *argv, 0))
 160                                 invarg("max addresses", *argv);
 161                 } else if (!matches(*argv, "port") ||
 162                            !matches(*argv, "srcport")) {
 163                         __u16 minport, maxport;
 164
 165                         NEXT_ARG();
 166                         if (get_u16(&minport, *argv, 0))
 167                                 invarg("min port", *argv);
 168                         NEXT_ARG();
 169                         if (get_u16(&maxport, *argv, 0))
 170                                 invarg("max port", *argv);
 171                         range.low = htons(minport);
 172                         range.high = htons(maxport);
 173                 } else if (!matches(*argv, "dstport")) {
 174                         NEXT_ARG();
 175                         if (get_u16(&dstport, *argv, 0))
 176                                 invarg("dst port", *argv);
 177                         dst_port_set = 1;
 178                 } else if (!matches(*argv, "nolearning")) {
 179                         learning = 0;
 180                 } else if (!matches(*argv, "learning")) {
 181                         learning = 1;
 182                 } else if (!matches(*argv, "noproxy")) {
 183                         proxy = 0;
 184                 } else if (!matches(*argv, "proxy")) {
 185                         proxy = 1;
 186                 } else if (!matches(*argv, "norsc")) {
 187                         rsc = 0;
 188                 } else if (!matches(*argv, "rsc")) {
 189                         rsc = 1;
 190                 } else if (!matches(*argv, "nol2miss")) {
 191                         l2miss = 0;
 192                 } else if (!matches(*argv, "l2miss")) {
 193                         l2miss = 1;
 194                 } else if (!matches(*argv, "nol3miss")) {
 195                         l3miss = 0;
 196                 } else if (!matches(*argv, "l3miss")) {
 197                         l3miss = 1;
 198                 } else if (!matches(*argv, "udpcsum")) {
 199                         udpcsum = 1;
 200                         udpcsum_set = true;
 201                 } else if (!matches(*argv, "noudpcsum")) {
 202                         udpcsum = 0;
 203                         udpcsum_set = true;
 204                 } else if (!matches(*argv, "udp6zerocsumtx")) {
 205                         udp6zerocsumtx = 1;
 206                         udp6zerocsumtx_set = true;
 207                 } else if (!matches(*argv, "noudp6zerocsumtx")) {
 208                         udp6zerocsumtx = 0;
 209                         udp6zerocsumtx_set = true;
 210                 } else if (!matches(*argv, "udp6zerocsumrx")) {
 211                         udp6zerocsumrx = 1;
 212                         udp6zerocsumrx_set = true;
 213                 } else if (!matches(*argv, "noudp6zerocsumrx")) {
 214                         udp6zerocsumrx = 0;
 215                         udp6zerocsumrx_set = true;
 216                 } else if (!matches(*argv, "remcsumtx")) {
 217                         remcsumtx = 1;
 218                 } else if (!matches(*argv, "noremcsumtx")) {
 219                         remcsumtx = 0;
 220                 } else if (!matches(*argv, "remcsumrx")) {
 221                         remcsumrx = 1;
 222                 } else if (!matches(*argv, "noremcsumrx")) {
 223                         remcsumrx = 0;
 224                 } else if (!matches(*argv, "external")) {
 225                         metadata = 1;
 226                 } else if (!matches(*argv, "noexternal")) {
 227                         metadata = 0;
 228                 } else if (!matches(*argv, "gbp")) {
 229                         gbp = 1;
 230                 } else if (matches(*argv, "help") == 0) {
 231                         explain();
 232                         return -1;
 233                 } else {
 234                         fprintf(stderr, "vxlan: unknown command \"%s\"?\n", *argv);
 235                         explain();
 236                         return -1;
 237                 }
 238                 argc--, argv++;
 239         }
 240
 241         if (metadata && vni_set) {
 242                 fprintf(stderr, "vxlan: both 'external' and vni cannot be specified\n");
 243                 return -1;
 244         }
 245
 246         if (!metadata && !vni_set) {
 247                 fprintf(stderr, "vxlan: missing virtual network identifier\n");
 248                 return -1;
 249         }
 250
 251         if ((gaddr && daddr) ||
 252                 (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) &&
 253                  memcmp(&daddr6, &in6addr_any, sizeof(daddr6)))) {
 254                 fprintf(stderr, "vxlan: both group and remote cannot be specified\n");
 255                 return -1;
 256         }
 257
 258         if (!dst_port_set) {
 259                 fprintf(stderr, "vxlan: destination port not specified\n"
 260                         "Will use Linux kernel default (non-standard value)\n");
 261                 fprintf(stderr,
 262                         "Use 'dstport 4789' to get the IANA assigned value\n"
 263                         "Use 'dstport 0' to get default and quiet this message\n");
 264         }
 265
 266         addattr32(n, 1024, IFLA_VXLAN_ID, vni);
 267         if (gaddr)
 268                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &gaddr, 4);
 269         else if (daddr)
 270                 addattr_l(n, 1024, IFLA_VXLAN_GROUP, &daddr, 4);
 271         if (memcmp(&gaddr6, &in6addr_any, sizeof(gaddr6)) != 0)
 272                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &gaddr6, sizeof(struct in6_addr));
 273         else if (memcmp(&daddr6, &in6addr_any, sizeof(daddr6)) != 0)
 274                 addattr_l(n, 1024, IFLA_VXLAN_GROUP6, &daddr6, sizeof(struct in6_addr));
 275
 276         if (saddr)
 277                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL, &saddr, 4);
 278         else if (memcmp(&saddr6, &in6addr_any, sizeof(saddr6)) != 0)
 279                 addattr_l(n, 1024, IFLA_VXLAN_LOCAL6, &saddr6, sizeof(struct in6_addr));
 280
 281         if (link)
 282                 addattr32(n, 1024, IFLA_VXLAN_LINK, link);
 283         addattr8(n, 1024, IFLA_VXLAN_TTL, ttl);
 284         addattr8(n, 1024, IFLA_VXLAN_TOS, tos);
 285         addattr8(n, 1024, IFLA_VXLAN_LEARNING, learning);
 286         addattr8(n, 1024, IFLA_VXLAN_PROXY, proxy);
 287         addattr8(n, 1024, IFLA_VXLAN_RSC, rsc);
 288         addattr8(n, 1024, IFLA_VXLAN_L2MISS, l2miss);
 289         addattr8(n, 1024, IFLA_VXLAN_L3MISS, l3miss);
 290         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_TX, remcsumtx);
 291         addattr8(n, 1024, IFLA_VXLAN_REMCSUM_RX, remcsumrx);
 292         addattr8(n, 1024, IFLA_VXLAN_COLLECT_METADATA, metadata);
 293
 294         if (udpcsum_set)
 295                 addattr8(n, 1024, IFLA_VXLAN_UDP_CSUM, udpcsum);
 296         if (udp6zerocsumtx_set)
 297                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, udp6zerocsumtx);
 298         if (udp6zerocsumrx_set)
 299                 addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 300         if (noage)
 301                 addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
 302         else if (age)
 303                 addattr32(n, 1024, IFLA_VXLAN_AGEING, age);
 304         if (maxaddr)
 305                 addattr32(n, 1024, IFLA_VXLAN_LIMIT, maxaddr);
 306         if (range.low || range.high)
 307                 addattr_l(n, 1024, IFLA_VXLAN_PORT_RANGE,
 308                           &range, sizeof(range));
 309         if (dstport)
 310                 addattr16(n, 1024, IFLA_VXLAN_PORT, htons(dstport));
 311
 312         if (gbp)
 313                 addattr_l(n, 1024, IFLA_VXLAN_GBP, NULL, 0);
 314
 315
 316         return 0;
 317 }
 318
 319 static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 320 {
 321         __u32 vni;
 322         unsigned int link;
 323         __u8 tos;
 324         __u32 maxaddr;
 325         char s2[64];
 326
 327         if (!tb)
 328                 return;
 329
 330         if (!tb[IFLA_VXLAN_ID] ||
 331             RTA_PAYLOAD(tb[IFLA_VXLAN_ID]) < sizeof(__u32))
 332                 return;
 333
 334         vni = rta_getattr_u32(tb[IFLA_VXLAN_ID]);
 335         fprintf(f, "id %u ", vni);
 336
 337         if (tb[IFLA_VXLAN_GROUP]) {
 338                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_GROUP]);
 339
 340                 if (addr) {
 341                         if (IN_MULTICAST(ntohl(addr)))
 342                                 fprintf(f, "group %s ",
 343                                         format_host(AF_INET, 4, &addr));
 344                         else
 345                                 fprintf(f, "remote %s ",
 346                                         format_host(AF_INET, 4, &addr));
 347                 }
 348         } else if (tb[IFLA_VXLAN_GROUP6]) {
 349                 struct in6_addr addr;
 350
 351                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_GROUP6]), sizeof(struct in6_addr));
 352                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0) {
 353                         if (IN6_IS_ADDR_MULTICAST(&addr))
 354                                 fprintf(f, "group %s ",
 355                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 356                         else
 357                                 fprintf(f, "remote %s ",
 358                                         format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 359                 }
 360         }
 361
 362         if (tb[IFLA_VXLAN_LOCAL]) {
 363                 __be32 addr = rta_getattr_u32(tb[IFLA_VXLAN_LOCAL]);
 364
 365                 if (addr)
 366                         fprintf(f, "local %s ",
 367                                 format_host(AF_INET, 4, &addr));
 368         } else if (tb[IFLA_VXLAN_LOCAL6]) {
 369                 struct in6_addr addr;
 370
 371                 memcpy(&addr, RTA_DATA(tb[IFLA_VXLAN_LOCAL6]), sizeof(struct in6_addr));
 372                 if (memcmp(&addr, &in6addr_any, sizeof(addr)) != 0)
 373                         fprintf(f, "local %s ",
 374                                 format_host(AF_INET6, sizeof(struct in6_addr), &addr));
 375         }
 376
 377         if (tb[IFLA_VXLAN_LINK] &&
 378             (link = rta_getattr_u32(tb[IFLA_VXLAN_LINK]))) {
 379                 const char *n = if_indextoname(link, s2);
 380
 381                 if (n)
 382                         fprintf(f, "dev %s ", n);
 383                 else
 384                         fprintf(f, "dev %u ", link);
 385         }
 386
 387         if (tb[IFLA_VXLAN_PORT_RANGE]) {
 388                 const struct ifla_vxlan_port_range *r
 389                         = RTA_DATA(tb[IFLA_VXLAN_PORT_RANGE]);
 390                 fprintf(f, "srcport %u %u ", ntohs(r->low), ntohs(r->high));
 391         }
 392
 393         if (tb[IFLA_VXLAN_PORT])
 394                 fprintf(f, "dstport %u ",
 395                         ntohs(rta_getattr_u16(tb[IFLA_VXLAN_PORT])));
 396
 397         if (tb[IFLA_VXLAN_LEARNING] &&
 398             !rta_getattr_u8(tb[IFLA_VXLAN_LEARNING]))
 399                 fputs("nolearning ", f);
 400
 401         if (tb[IFLA_VXLAN_PROXY] && rta_getattr_u8(tb[IFLA_VXLAN_PROXY]))
 402                 fputs("proxy ", f);
 403
 404         if (tb[IFLA_VXLAN_RSC] && rta_getattr_u8(tb[IFLA_VXLAN_RSC]))
 405                 fputs("rsc ", f);
 406
 407         if (tb[IFLA_VXLAN_L2MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L2MISS]))
 408                 fputs("l2miss ", f);
 409
 410         if (tb[IFLA_VXLAN_L3MISS] && rta_getattr_u8(tb[IFLA_VXLAN_L3MISS]))
 411                 fputs("l3miss ", f);
 412
 413         if (tb[IFLA_VXLAN_TOS] &&
 414             (tos = rta_getattr_u8(tb[IFLA_VXLAN_TOS]))) {
 415                 if (tos == 1)
 416                         fprintf(f, "tos inherit ");
 417                 else
 418                         fprintf(f, "tos %#x ", tos);
 419         }
 420
 421         if (tb[IFLA_VXLAN_TTL]) {
 422                 __u8 ttl = rta_getattr_u8(tb[IFLA_VXLAN_TTL]);
 423
 424                 if (ttl)
 425                         fprintf(f, "ttl %d ", ttl);
 426         }
 427
 428         if (tb[IFLA_VXLAN_AGEING]) {
 429                 __u32 age = rta_getattr_u32(tb[IFLA_VXLAN_AGEING]);
 430
 431                 if (age == 0)
 432                         fprintf(f, "ageing none ");
 433                 else
 434                         fprintf(f, "ageing %u ", age);
 435         }
 436
 437         if (tb[IFLA_VXLAN_LIMIT] &&
 438             ((maxaddr = rta_getattr_u32(tb[IFLA_VXLAN_LIMIT])) != 0))
 439                     fprintf(f, "maxaddr %u ", maxaddr);
 440
 441         if (tb[IFLA_VXLAN_UDP_CSUM]) {
 442                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_CSUM]))
 443                         fputs("no", f);
 444                 fputs("udpcsum ", f);
 445         }
 446
 447         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
 448                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
 449                         fputs("no", f);
 450                 fputs("udp6zerocsumtx ", f);
 451         }
 452
 453         if (tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
 454                 if (!rta_getattr_u8(tb[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
 455                         fputs("no", f);
 456                 fputs("udp6zerocsumrx ", f);
 457         }
 458
 459         if (tb[IFLA_VXLAN_REMCSUM_TX] &&
 460             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_TX]))
 461                 fputs("remcsumtx ", f);
 462
 463         if (tb[IFLA_VXLAN_REMCSUM_RX] &&
 464             rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_RX]))
 465                 fputs("remcsumrx ", f);
 466
 467         if (tb[IFLA_VXLAN_COLLECT_METADATA] &&
 468             rta_getattr_u8(tb[IFLA_VXLAN_COLLECT_METADATA]))
 469                 fputs("external ", f);
 470
 471         if (tb[IFLA_VXLAN_GBP])
 472                 fputs("gbp ", f);
 473 }
 474
 475 static void vxlan_print_help(struct link_util *lu, int argc, char **argv,
 476         FILE *f)
 477 {
 478         print_explain(f);
 479 }
 480
 481 struct link_util vxlan_link_util = {
 482         .id             = "vxlan",
 483         .maxattr        = IFLA_VXLAN_MAX,
 484         .parse_opt      = vxlan_parse_opt,
 485         .print_opt      = vxlan_print_opt,
 486         .print_help     = vxlan_print_help,
 487 };